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A histogram of heights (cm) has classes of equal width 5: 150-155, 155-160, 160-165, 165-170
with frequencies 6, 11, 9, 4.
If the bar for 155-160 has area 55 square units, what is the area of the bar for 160-165?

Class 9Bar Graphs and HistogramsStatistics and Probability
  • A49
  • B45
  • C41
  • D90

Step-by-Step Solution

Equal widths means area is proportional to frequency. Area per unit frequency = . For 160-165: .
Answer: B) 45

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